Our church has three projectors in the sanctuary. 1 in the back for those on stage to see. 2 aimed at the left and right sides of the baptistery so people on opposite sides can see. They project onto blank walls.
We replaced all three of them over the last six years. Now we need to replace another of the front-facing projectors. They are only used 2-3 hours/week on Sunday morning (start them up about 9:30, and they stay on till noon to-12:30. They are Viewsonics connected by DVI to a box that converts from Cat 6 to DVI on each end of the CAT 6 cable which runs through the attic back to the computer in the balcony at back - about 250 feet of cable.

So now you know our setup. What would you buy, or what do you own that would work?
The light is a little bright, but because of where they are hanging, there are no windows in that part of the sanctuary.